Boston Restaurant Recommendations (seafood and Asian especially)

I'm heading to boston tomorrow just to explore with a friend. I was wondering if anyone could recommend any good restaurants to check out...preferably on the cheap end. Need a place to check out for lunch and dinner. Since it's boston I thought i should checkout the seafood so if anyone can recommend any good seafood. I'll be arriving at South Street station so any good restaurants recommendations around there would also be appreciated.

so key points:
- affordable (i'm a college student so is my friend)
- metro boston area (i'll be walking all of it)
- seafood = awesome

oh yeah is boston a good place to find clam chowder? It's my first time going to Boston